Doutres, Olivier et Dauchez, Nicolas.
2005.
« Characterisation of porous materials viscoelastic properties involving the vibro-acoustical behaviour of coated panels ».
In SAPEM 2005 : Symposium on the Acoustics of Poro-Elastic Materials : December 7 - 8 - 9, 2005, ENTPE, Lyon, France (Lyon, France, Dec. 7-9, 2005)
France : École Nationale des Travaux Publics de l'État.
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Abstract
Porous materials are widely used for noise control. Often attached to a structure subjected to
vibration, the porous layer contributes to diminish vibration by increasing structural damping and
also reduce noise level in cavities by sound absorption. For optimal design, it is often necessary to
know the viscoelastic properties of these materials in the frequency range relevant to their application.
At these frequencies and for most of porous materials the viscoelastic properties can not
be determined by standard methods because of the strong coupling with air. The method proposed
is based on measurements representative of industrial use (car, aircraft, train): acoustic radiation
of vibrating coated panel and transmission loss of coated panel. The use of an inverse methode
based on analytical models to determined the viscoelatic properties insure a good simulation of
the porous material behaviour in the required context.
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